Either set Symbology property in codebehind .cs file

BCSBarcodeCtrl1.Symbology = 14;

Or add a tag directly

< img src="barcodesoft.ashx?s=code25

Code 25 bar code symbology, also known as standard 2 of 5, or industrial 2 of 5, is designed to encode numeric-only data.

A modulo 10 check digit is optional.

See Also
Interleaved 25